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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd586fc4ae373854b13beb9d7caa1277e51003979f189d83557932016bb825fb8' 
  AND token = 'E/963cTyghE+biRQkm+vG6C64Qb9BR2oFx/0qbwfYTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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