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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067824cf538d13baf12fe0503e49d0630e505efbdc2add24bb6a68a00372f17c' 
  AND token = 'mj+IWrkvADqlgJFXvDd7bqSCtDMFjWn5JxM+5yw80WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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