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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b008a3f60075a72c0f1b120d53f5d68b72aa201303a3eed9035a18f295ef8185' 
  AND token = 'u3AOeehVT6mkh+fYgXP84bjob2JxQiBaOdptg8yJMf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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