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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99709acd699bd9345f445c212cc2088e262d4ee305420d4dd42c06ed72b601e6' 
  AND token = '5Jc5kAyuGATxJgZoLaWbiMpWwJHL1LirTus2Ic2QykI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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