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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a440d24f5f3186d4f12be2c4272c9e57741f92f4ae51f74f50cf58ed25c4ca' 
  AND token = 'NgKnI8YyoSQdoaLuILipSBywlEfNeq5Y4PPCotCAI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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