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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231645d8af67fb29c369642de8a1235e8f4f3229a7c9cb488396ae2993fbf552' 
  AND token = 'DYw9PKr0CjgYIE1j1fzXXXDd2206hiypOhmSw+kMkB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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