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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067f8bb5280a807feee5794da4ace72a5e87f735c7682a32ee0a841d6303e295' 
  AND token = 'FW6UcfE9xc2G7j2hIIDdtUIPWYp991zbivPXR0LZBdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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