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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2bbfc4d9691d02a8dc5ceb291e2138ac1ec10379dc60e6850d15d5c9fc9b0e' 
  AND token = '1Ocb3wgm4G0XweCQYAzL250IawYiARLwuEeFEAqMGQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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