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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1be93f56c3c817c01bf9e1d64a20f81cfe5d653f2c9291a3decaba45c6250a' 
  AND token = 'UCEHog6f+33u+QsR6NrCbUwya9NCeTfmq5NobDf3UQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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