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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ca4f93ed0d1c07c0fb3e4a704a08293de444d63060aeb2c1ec31b30dfa77c4' 
  AND token = 'Aibs7mSyV2BOFCfIIoaBFcT8q5tuQkw6WPdeP4dVSB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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