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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1207b02a57a5d1aa9ce7534ce894e07c6698ff8bab15ca7a153dc3f9e8e0bf2' 
  AND token = 'bmJUc17ABhZoObvtYmd7I38XupCp8gVl9WJbNACv3Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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