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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae56287f1cfedb23e2f805c200e0ec371d1167559c74b55931e7340b247e6cf' 
  AND token = '8KCq0Cidmt3BlfuxgvSe1n9z0P8vTY+NCOpK1ofry7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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