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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6821697e5e9cf13928206c9e6da59886977e24a897b2a4f7c83f5809c08a61' 
  AND token = 'ALFa/RjoFZ3oD3DhP5Tkxzegtckt27O1MmDyHuEFxm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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