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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238c896c44bac85125d4ee6c04ebc9782be16401061f1ab1c1c243ad5cbb851b' 
  AND token = 'oqPTIqx5oX0nyfyHYJHujqsxDreXFrgbq4YVOjrb1YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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