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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4a9369246476ae339fa48ff9e43d97821c386107bbab00d1d43d26bc419762' 
  AND token = '2wOV1TvduG8PHH2iE8b5uKP1lhnZspxUkH2X7MyzXcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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