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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90621c2766de86594fadde659e949231623d5edcbb124423cfd429ea040a31da' 
  AND token = '2qoFVgd8YS37ANF3Zosk9A0RFZa3mSTvIJ1Qo23r0m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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