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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80606126c3c5a6a3aeba64c74d753eb3ffbc79b8ac9331275a1d3d1df743e7c' 
  AND token = '7MaOOGBS6B47BxupjaxnX0kT72NjwnszHEU6yJL7tXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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