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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6014ebe8f6e4a73f5a314182e791501cf94c658f9ae20febbcc8f13a915f474b' 
  AND token = 'caaPiY7LsHT6ky59DPdy6xCh84xgCbUnEpfxZ/JOuxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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