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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dc9c23b44a9a9edbbd014fd349136732aa0309cc4544369acc34712d485379' 
  AND token = 'gtU10pepccjrjBSkP+eMFCnMm8gOTNIV3b1hz6fDJSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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