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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7303a8dd7fa855662958751d600cb8d31cb7d5068c49ceadb4d497ca206840ca' 
  AND token = '+6K/QiANf9jFe5Gv9eeP40BDeMHaK93yz17nH5NP4Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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