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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742fca47a0c4a9ff59decdfafca9949a49a12c56a793d64b95428141da89b276' 
  AND token = 'c6LnQm5aPv8HcIPF2xDb5eIK8Mp6+cK4eFSmxq+Skkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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