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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ec897f57adfbbc040b6f0307fa4a342b6a7373ff30c6eca0d87b7f79a47aa5' 
  AND token = 'uw9jRMYgADYPhz596C65J0rXMc+MRMzpLmzHK/m8EIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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