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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf738e81a16473fa8c259231e9d069f45e1c90b98bd30cb14cc668c1850bf7d' 
  AND token = 'GHjVfp4HDb1cGe4LJ8uNGd7yrVoeRQxhCRmfM6uKUoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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