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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a41faeb514c9c57b75bf4965f0a7287c11444f605c5784a9c32e2445f817c90' 
  AND token = '3AM6XVrUr0HkapVh62qk02XY0FdWd1KTx38kEo7hN8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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