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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655821e5ddc7d9ce82879aa83f527c15b41a7991407efdfd3e378932ea87ce9e' 
  AND token = 'B1+2/vLsb75WDtB4JXLT25hg0QIRoaZeQ9UaHRD5wTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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