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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dce63a915238b4e3d19d970ff387d21201c8c486373911b6d9731fa0af2f88' 
  AND token = '1uc4ZWwk9XKfm/RjtuZs9MMTMTH6URcI+39Aq/tFin8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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