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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373ae03383f0ab9e28e649932b471f32bba2ba8a17df1b9fe8cb4482042c2c14' 
  AND token = 'tW25axVslslb3L5I3J1NMMkkJYuqbY3WJmmlONJJc34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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