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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf6bb0e70bc6986ee110789415cda3fda0906e41aa81fc09102ae4d2f170b5c' 
  AND token = '4hMiLlNfm6I3B6EleJjmLHFEkC2BGUk/5r9twzChk7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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