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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56005d662d29a6c76e14b4d6d1b59b85c47a073115237c5059d22a437b521f4a' 
  AND token = 'JkupPWUSNtiix5DXV+1Zt4Vru6/S/nLJVL7vQo+fcZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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