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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf523ce5a9bc646f97b85e2aabb972263202ba5804a6c848beb5c7158f46a489' 
  AND token = 'c2zeIb9i8ByaRVpZ8KX1SpksJtE/FZXpN/DxYUlQyaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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