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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2835fca6eb61585263d9a73f02c738de20a38a6bceb7c4957e6953df18e70c4' 
  AND token = 'MCA95G4jkeIt03/guOTEGj+KCxyMR/KbH0X8VSn6g+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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