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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cb247be419e9aa5b6c422b425aee1238bb35fdc69b32a732a1c331d60c3aae' 
  AND token = 'W5yy4yWOsO3y6Z86AWUsXS0kCa9Ja3r0bkH5mKkTjgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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