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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b828258b6a125405cadd4ce22df272eb6aabdbbc390c51c8ef03aae94ef9a9' 
  AND token = 'RJfK5ahhRcVQ39XF/HEpk2mwkbsyDwNERzq06qNwo4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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