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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56105fef07c275afd00c5c23e0004d6714b2365a1f4308d1e21f5e2ff5b3ea50' 
  AND token = '5V0Dfm5lYqHNKxvSEYoEB/9j3ZppLX3skTL8xHpvGvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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