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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e09de3abd6dcd93de1574fcfdedc2a5c709897a29a853507a097251619d984' 
  AND token = '1LMDpD6S+ebJ++EZWZDTJgPVIaqTNveWE+gDu/nTaBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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