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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878b8a29ae3581c8546fd43da5eee1602eec94fb7c704d33c3f3995e6d697512' 
  AND token = 'CLgJyMU4pmGsUPRl9qItjy+IBv3ATJQy57QE2yBAA0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}