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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1405e9a168a6a86bc977d4a2ccb03b5124db8f3d78bb3f388bcd56995a6c134' 
  AND token = 'xRy0sNIWVUccJoKZ+zNdJ5DMc2T2oH/r1Z59vgPNQ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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