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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1345f5d4debbcfbd5eee9e2c2393b95c41ee831d00e5bfd04ebb0c71192349cc' 
  AND token = 'b75z8s8v/M2EqHE12U+jDJ/JvFupShoqsAw9RiNdMQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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