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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833af3c1c5aad0b09b268d73c4074297d831cf7dda9923c7454be66ca3fee6ad' 
  AND token = 'aIgDaLmvKQgXIlyt7DMvXSpxGoGF2Pvu7LSidyy/CIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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