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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b927e3663539de04992288732e1734b902aba982f7d4958f67815cc38c0ef141' 
  AND token = 'Cv9eIlOTx8DojdFv0F+tOWE9Uf1GuV3aUV8UydDrZTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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