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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051f792f3e5bb7502c68be1cc098e468f332007290ae595def4035a33a286ab6' 
  AND token = '3nrU2ILwkJumAilukhbxjB7hiid7Mm1u7lraHQmf4HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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